class MyHashSet:
    def __init__(self):
        self.set = {9 ** 99}

    def add(self, key: int) -> None:
        self.set.add(key)

    def remove(self, key: int) -> None:
        if key in self.set:
            self.set.remove(key)

    def contains(self, key: int) -> bool:
        if key in self.set:
            return True
        else:
            return False


# Your MyHashSet object will be instantiated and called as such:
a = 1
obj = MyHashSet()
obj.add(a)
obj.add(a)
obj.remove(a)
obj.remove(a)
print(obj.contains(a))
# param_3 = obj.contains(key)

